US8207820B2 - Location localization method and system - Google Patents
Location localization method and system Download PDFInfo
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- US8207820B2 US8207820B2 US12/180,664 US18066408A US8207820B2 US 8207820 B2 US8207820 B2 US 8207820B2 US 18066408 A US18066408 A US 18066408A US 8207820 B2 US8207820 B2 US 8207820B2
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- rfid tag
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C21/00—Systems for transmitting the position of an object with respect to a predetermined reference system, e.g. tele-autographic system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2209/00—Arrangements in telecontrol or telemetry systems
- H04Q2209/40—Arrangements in telecontrol or telemetry systems using a wireless architecture
- H04Q2209/47—Arrangements in telecontrol or telemetry systems using a wireless architecture using RFID associated with sensors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2209/00—Arrangements in telecontrol or telemetry systems
- H04Q2209/70—Arrangements in the main station, i.e. central controller
- H04Q2209/75—Arrangements in the main station, i.e. central controller by polling or interrogating the sub-stations
Definitions
- the present invention relates to a method and associated system for locating passive radio frequency identification (RFID) tags.
- RFID radio frequency identification
- Locating out of range items typically comprises an inefficient process with little flexibility. Accordingly, there exists a need in the art to overcome at least some of the deficiencies and limitations described herein above.
- the present invention provides a method comprising:
- the present invention provides an RFID tag reader comprising a processor coupled to a computer-readable memory unit, said memory unit comprising instructions that when executed by the processor implements a location localization method, said method comprising:
- the present invention advantageously provides a simple method and associated system capable of locating out of range items.
- FIG. 1 illustrates a block diagram of a system for locating a passive RFID tag via active RFID tags, in accordance with embodiments of the present invention.
- FIG. 2 illustrates a process for implementing the system of FIG. 1 for calculating a distance between a polled RFID tag and a non-polled RFID tag, in accordance with embodiments of the present invention.
- FIG. 3 illustrates a facility map describing a passive RFID tag read range, in accordance with embodiments of the present invention.
- FIG. 4 illustrates a facility map describing an active RFID tag read range, in accordance with embodiments of the present invention.
- FIG. 5 illustrates a facility map describing an RFID tag listening range, in accordance with embodiments of the present invention.
- FIG. 6 illustrates a facility map describing a communication process for communicating with a passive RFID tag via active RFID tags, in accordance with embodiments of the present invention.
- FIG. 7 illustrates a flowchart describing an algorithm used by the system of FIG. 1 for locating a passive RFID tag via active RFID tags, in accordance with embodiments of the present invention.
- FIG. 8 illustrates a computer apparatus used for locating a passive RFID tag via active RFID tags, in accordance with embodiments of the present invention.
- FIG. 1 illustrates a block diagram of a system 2 comprising a computing system 10 , a radio frequency identification (RFID) tag reader (or transceiver) 5 , a passive RFID tag 8 , active RFID tags 12 a , and active RFID tags 12 b , in accordance with embodiments of the present invention.
- a RFID tag e.g., passive RFID tag 8 , active RFID tags 12 a (e.g., proxy RFID tags), active RFID tags 12 b (e.g., proxy RFID tags), etc
- a RFID tag comprises a computer readable memory unit, a central processing unit (CPU) and logic for executing functions.
- a passive RFID tag is defined herein as an RFID tag that receives power (i.e., for powering circuits internal to the RFID tag) from an RFID tag reader.
- An active RFID tag is defined herein as an RFID tag that comprises an internal (i.e., internal to the RFID tag) power source (e.g., a battery, a capacitor, etc) for powering circuits internal to the RFID tag.
- a passive RFID tag may only communicate (e.g., respond to RF queries) with an RFID tag reader over small distances (e.g., less than about 10 meters) because it obtains its power from the RFID tag reader.
- An active RFID tag may communicate (e.g., respond to RF queries) with an RFID tag reader over greater distances (e.g., up to about 100 meters) than distances between a passive RFID tag and an RFID tag reader because the active RFID tag comprises an internal power source.
- RFID tag reader 5 uses information supplied by active RFID tags 12 a or active RFID tags 12 b (e.g., data associated with distance information associated with a distances between passive RFID tag 8 and active RFID tags 12 a or RFID tags 12 b and time stamp information associated with a time and date of the measurement of the distances) and information from computing system 10 (e.g., a map of a facility comprising system 2 and locations on the map for active RFID tags 12 a or active RFID tags 12 b ) to determine a location for passive RFID tag 8 .
- RFID tag reader 5 uses information from RFID tags 12 a or RFID tags 12 b depending on the time and date information as described, infra with respect to FIG. 2 .
- System 2 may be used in a warehouse environment to identify, track, and locate items by placing passive RFID tag 8 on the item (or on a pallet comprising the item) and using RFID reader 5 to query active RFID tags 12 a and active RFID tags 12 b in order to obtain data (i.e., data associated with distance information associated with distances between passive RFID tag 8 and active RFID tags 12 a or active RFID tags 12 b and time stamp information associated with a time and date of the measurement of the distances).
- Passive RFID tag 8 , RFID reader 5 , active RFID tags 12 a , and active RFID tags 12 b may each be on different floors of a facility (e.g., different floors of a warehouse).
- Computing system 10 may comprise, inter alia, a personal computer, a laptop computer, a computer terminal, a server computer, etc.
- Computing system 10 may comprise a single computing apparatus or a plurality of computing apparatuses.
- System 2 allows RFID tags (passive or active) to listen neighbor RID tags responses and calculate distances between RFID tags based on the responses.
- Each RFID tag is able to determine a neighbor RFID Tag within a defined radius and return (i.e., when polled) a list of neighbor RFID tags detected by an RFID tag reader.
- the RFID reader compiles the list of neighbor RFID tags to determine all RFID tags belonging to a same package (e.g., a pallet).
- An RFID tag reader performs the following functions:
- Example 1 illustrates an implementation example for using system 2 to locate an item associated with passive RFID tag 8 .
- FIG. 2 illustrates a process for implementing system 2 of FIG. 1 for calculating a distance between a polled RFID tag (e.g., passive RFID tag 8 ) and a non-polled RFID tag (e.g., one of active RFID tags 12 a or 12 b ), in accordance with embodiments of the present invention.
- An RFID tag reader 200 polls an RFID Tag B.
- RFID tag A it is assumed that RFID tag A has been already been polled and therefore RFID tag A knows a distance T 1 between itself and RFID tag reader 200 .
- RFID tag B knows distance T 2 between RFID tag B and RFID tag reader 200 , RFID tag B knows distance T 2 .
- RFID tag B After processing the polling, RFID tag B transmits a response comprising a tag Id (i.e., for RFID tag B) and the distance T 2 . The response is additionally received by several RFID Tags adjacent to RFID tag B.
- RFID tag A computes a delay ⁇ t between a reception of the polling of RFID tag B and a response from the RFID tag B.
- the polling command transmitted by RFID tag reader 200 arrives in RFID tag A at time T 1 and arrives in RFID tag B at time T 2 .
- RFID tag B is further than RFID tag A from RFID tag reader 200 and therefore, commands arrive in RFID tag B T 2 ⁇ T 1 later than in RFID tag A.
- the response from RFID tag B arrives in RFID tag A (time reference is the command transmitted by the reader) at time T 2 +TP+T 3 .
- T 2 , T 3 , and TP The following relationships exist with respect to T 2 , T 3 , and TP:
- Circle 225 with radius R 2 represents an area (volume) where RFID tags are neighbours of RFID tag A.
- FIG. 3 illustrates a facility map 300 describing a passive RFID tag read range 309 , in accordance with embodiments of the present invention.
- Facility map 300 comprises a facility 301 (e.g., a warehouse), rows 302 for items, an item 304 comprising a passive RFID tag and a forklift truck 305 comprising an RFID tag reader 305 a .
- RFID tag reader 305 a has a limited passive RFID tag read range 309 and therefore RFID tag reader 305 a is unable to communicate with item 304 comprising a passive RFID tag.
- FIG. 4 illustrates a facility map 400 describing an active RFID tag read range 402 , in accordance with embodiments of the present invention.
- Facility map 400 comprises a facility 401 (e.g., a warehouse), rows 404 for items, item 304 comprising a passive RFID tag, items 405 comprising active RFID tags, and a forklift truck 305 comprising an RFID tag reader 305 a .
- RFID tag reader 305 a has a limited passive RFID tag read range 309 and a broader active RFID tag read range 402 . Therefore RFID tag reader 305 a is able to communicate with items 405 comprising active RFID tags but is unable to communicate with item 304 comprising a passive RFID tag.
- FIG. 5 illustrates a facility map 500 describing an RFID tag listening range 502 , in accordance with embodiments of the present invention.
- Facility map 500 comprises passive RFID tag read range 309 , listening RFID tag 505 , and responding tags 507 (i.e., for responding to RFID tag reader 305 a ).
- FIG. 6 illustrates a facility map 600 describing a communication process for communicating with a passive RFID tag via Active RFID tags, in accordance with embodiments of the present invention.
- Facility map 600 comprises a facility 601 (e.g., a warehouse), rows 404 for items, item 304 comprising a passive RFID tag, items 405 comprising active RFID tags, and a forklift truck 305 comprising an RFID tag reader 305 a .
- RFID tag reader 305 a has a limited passive RFID tag read range 309 and a broader active RFID tag read range 402 . Therefore RFID tag reader 305 a is able to communicate item 304 comprising an active RFID tag via communications with items 405 comprising active RFID tags as described with reference to FIGS. 1 and 2 , supra, and FIG. 6 , infra.
- FIG. 7 illustrates a flowchart describing an algorithm used by system 2 of FIG. 1 for locating a passive RFID tag via active RFID tags, in accordance with embodiments of the present invention.
- an RFID tag reader on a forklift truck e.g., RFID tag reader 5 of FIG. 1
- transmits a request for locating an item e.g., a pallet
- the RFID tag reader receives from a first group of RFID tags (e.g., active of passive), first data/time data associated with first data.
- the first date/time data indicates a date and time that the first data was retrieved.
- the RFID tag reader receives from a second group of RFID tags (e.g., active of passive), second data/time data associated with second data.
- the second date/time data indicates a date and time that the second data was retrieved.
- the RFID tag reader determines that the first date/time data comprises an earlier date/time than the second date/time data with respect to a current date/time.
- RFID tag reader transmits a request to the second group of active RFID tags a request for retrieving the second data.
- the second data may comprise an ID for the passive RFID tag and distances between each RFID tag of the second group of RFID tags and the first passive RFID tag.
- the RFID tag reader receives the second data from the second group of RFID tags.
- the RFID tag reader receives stored data from a computing system.
- the stored data comprises a map of the facility and locations on said map for the second group of RFID tags.
- the REID tag reader determines a location within the facility for the passive RFID tag. The location is determined based on said second data, the map of the facility, and the locations on said map for the second group of RFID tags.
- the RFID reader transmits the location a user (e.g., the driver of the forklift truck).
- step 732 it is determined if additional items (with passive RFID tags) are to be located. If in step 732 , it is determined that additional items (with passive RFID tags) are to be located then step 702 is repeated to locate additional passive RFID tags.
- the additional passive RFID tags may be located anywhere in the facility (e.g., on a different floor). If in step 732 , it is determined that additional items (with passive RFID tags) are not to be located then the process is terminated in step 735 .
- FIG. 8 illustrates a computer apparatus 90 (e.g., computing system 10 or RFID tag reader 5 of FIG. 1 ) used for locating a passive RFID tag via active RFID tags, in accordance with embodiments of the present invention.
- the computer system 90 comprises a processor 91 , an input device 92 coupled to the processor 91 , an output device 93 coupled to the processor 91 , and memory devices 94 and 95 each coupled to the processor 91 .
- the input device 92 may be, inter alia, a keyboard, a software application, a mouse, etc.
- the output device 93 may be, inter alia, a printer, a plotter, a computer screen, a magnetic tape, a removable hard disk, a floppy disk, a software application, etc.
- the memory devices 94 and 95 may be, inter alia, a hard disk, a floppy disk, a magnetic tape, an optical storage such as a compact disc (CD) or a digital video disc (DVD), a dynamic random access memory (DRAM), a read-only memory (ROM), etc.
- the memory device 95 includes a computer code 97 .
- the computer code 97 includes algorithms (e.g., the algorithm of FIG. 7 ) for locating a passive RFID tag via active RFID tags.
- the processor 91 executes the computer code 97 .
- the memory device 94 includes input data 96 .
- the input data 96 includes input required by the computer code 97 .
- the output device 93 displays output from the computer code 97 .
- Either or both memory devices 94 and 95 may comprise the algorithm of FIG. 7 and may be used as a computer usable medium (or a computer readable medium or a program storage device) having a computer readable program code embodied therein and/or having other data stored therein, wherein the computer readable program code comprises the computer code 97 .
- a computer program product (or, alternatively, an article of manufacture) of the computer system 90 may comprise said computer usable medium (or said program storage device).
- any of the components of the present invention could be created, integrated, hosted, maintained, deployed, managed, serviced, etc. by a service provider who offers to locate a passive RFID tag via active RFID tags.
- the present invention discloses a process for deploying, creating, integrating, hosting, maintaining, and/or integrating computing infrastructure, comprising integrating computer-readable code into the computer system 90 , wherein the code in combination with the computer system 90 is capable of performing a method for locating a passive RFID tag via active RFID tags.
- the invention provides a business method that performs the process steps of the invention on a subscription, advertising, and/or fee basis. That is, a service provider, such as a Solution Integrator, could offer to locate a passive RFID tag via active RFID tags.
- the service provider can create, maintain, support, etc. a computer infrastructure that performs the process steps of the invention for one or more customers.
- the service provider can receive payment from the customer(s) under a subscription and/or fee agreement and/or the service provider can receive payment from the sale of advertising content to one or more third parties.
- FIG. 8 shows the computer system 90 as a particular configuration of hardware and software
- any configuration of hardware and software may be utilized for the purposes stated supra in conjunction with the particular computer system 90 of FIG. 8 .
- the memory devices 94 and 95 may be portions of a single memory device rather than separate memory devices.
Abstract
Description
- 1. Computes a distance between the RFID tag reader and a polled RFID tag.
- 2. Sets the distance between the RFID tag reader and the polled RFID tag and transmits the distance to the polled RFID tag.
- 3. Associates RFID tags to a group or package.
An RFID tag performs the following functions: - 1. Memorizes the distance between the RFID tag reader and itself.
- 2. All RFID tags measure a time separating a polling request and a response from a polled RFID tag in order to:
- 1. A forklift truck enters a warehouse with the pallet ID number 223 in order to stock the pallet on a shelf in the warehouse. A passive RFID (e.g., passive RFID tag 8) is placed on the pallet.
- 2. The forklift truck arrived at a final location for the shelf and an RFID tag reader (e.g., RFID tag reader 5) on the forklift truck interrogates the passive RFID tag.
- 3. The nearest active RFID tags (e.g., active RFID tags 12 a and active RFID tags 12 b) listen to the passive RFID tag response, log the RFID tag reader time stamp, and RFID tag IDs, and measure distances to the passive RFID tag from their own position.
- 4. After a time period (e.g., days, months, years, etc) the RFID tag reader on the forklift truck (i.e., looking for a location of pallet 223) transmits a request for locating pallet 223.
- 5. The nearest active RFID tags (e.g., active RFID tags 12 a and active RFID tags 12 b) respond with data associated with pallet 223 ID and time stamps.
- 6. The RFID tag reader receives two different time stamps:
- 7. The RFID tag reader determines that time stamp T1 comprises an earlier time than time stamp T2.
- 8. The RFID tag reader requests information (i.e., the measured distances to the passive RFID tag) from the second group of active RFID tags based on the later time stamp T2 (i.e., the more recent time stamp).
- 9. The REID tag reader receives from a computing system (e.g., computing system 10), a map of the warehouse and locations on the map for the second group of active RFID tags.
- 10. The RFID tag reader determines a location in the ware house for pallet 223. The location is determined based on the information received in
step 7 and 8. - 11. The RFID tag reader transmits the location to a driver of the forklift truck so that the driver may locate pallet 223.
- 1. Distance T2 is proportional to the distance between
RFID tag reader 200 and RFID tag B. - 2. TP is the processing time.
- 3. Distance T3 is proportional to the distance between the RFID tag B and RFID tag A.
Δt=(T2+T3+TP)−T1
Δt=(T2−T1)+T3+TP
T3=Δt−(T2−T1)−TP
Δt=(T4+T5+TP)−T1
Δt=(T4−T1)+T5−TP
T5=Δt−(T4−T1)−TP
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